Spa shell



FIG. 1 is a first perspective view of the spa shell of the invention;

FIG. 2 is a second perspective view of the spa shell illustrated in FIG. 1;

FIG. 3 is a top plan view of the spa shell illustrated in FIG. 1;

FIG. 4 is a first side view of the invention illustrated in FIG. 1; and,

FIG. 5 is a second side view of the spa shell illustrated in FIG. 1.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a spa shell, as shown and described. 